#!/bin/bash
#Program:
#	This program shows "Hello World!" in your screen.
#History:
#20171113	zhouxh	v1
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

while [ "${yn}" != "yes" -a "${yn}" != "YES" ]
do
	read -p "Please input yes/YES to stop this program: " yn
done
	echo "OK! you input the correct answer."

